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A kind of silver paste for solar cell and preparation method thereof

A technology of solar cells and silver paste, which is applied in the manufacture of cables/conductors, circuits, electrical components, etc. It can solve the problems that the thixotropy of the front silver paste needs to be improved, so as to promote compatibility, improve dispersion performance, and reduce the light-receiving area Effect

Active Publication Date: 2011-12-21
CHANGZHOU SVECK PHOTOVOLTAIC NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thixotropy and stability of the front silver paste in the prior art still need to be improved to improve the efficiency of solar cells

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In the present embodiment, the silver paste for the front electrode of the solar cell has components and mass percentages as follows:

[0027] Silver powder 73%, its purity is 99.99%, particle size 0.5-2 microns;

[0028] Turpentine 12%, its purity is 99%;

[0029] Non-ionic polymer surfactant: polyethoxypolypropoxypolyethoxytriblock copolymer (P123) 3%;

[0030] 10% glass powder, the mass percentage of its components is ZnO: 5-10%, PbO: 10-20%, Bi 2 o 3 : 5-10%, Al 2 o 3 : 15-20%, SiO 2 : 30-50%, B 2 o 3 : 10-20%, the purity is more than 99%, and the particle diameter is 5-10 nanometers;

[0031] Methyl-modified fumed silica is 2%, its purity is 99%, and its particle size is 10-20 nanometers.

[0032] Stir evenly in a high-speed mixer according to the above ratio, then put it into a stainless steel three-stick machine and mix for 3-5 times, and finally prepare a uniformly mixed silver paste sample.

Embodiment 2

[0034] In the present embodiment, the silver paste for the front electrode of the solar cell has components and mass percentages as follows:

[0035] Silver powder 73%, its purity is 99.99%, particle size 0.5-2 microns;

[0036] Turpentine 12%, its purity 99%;

[0037] Nonionic polymer surfactant: polyethoxypolypropoxypolyethoxytriblock copolymer (P-123) 4%;

[0038] 10% glass powder, the mass percentage of its components is ZnO: 5-10%, PbO: 10-20%, Bi 2 o 3 : 5-10%, Al 2 o 3: 15-20%, SiO 2 : 30-50%, B 2 o 3 : 10-20%, the purity is more than 99%, and the particle diameter is 5-10 nanometers;

[0039] Methyl-modified fumed silica 1%, its purity is 99%, particle size 10-20 nanometers.

[0040] Stir evenly in a high-speed mixer according to the above ratio, then put it into a stainless steel three-stick machine and mix for 3-5 times, and finally prepare a uniformly mixed silver paste sample.

Embodiment 3

[0042] In the present embodiment, the silver paste for the front electrode of the solar cell has components and mass percentages as follows:

[0043] Silver powder 73%, its purity is 99.99%, particle size 0.5-2 microns;

[0044] Turpentine 12%, its purity is 99%;

[0045] Non-ionic polymer surfactant: polyethoxypolypropoxypolyethoxytriblock copolymer (P123) 4.5%;

[0046] 10% glass powder, the mass percentage of its components is ZnO: 5-10%, PbO: 10-20%, Bi 2 o 3 : 5-10%, Al 2 o 3 : 15-20%, SiO 2 : 30-50%, B 2 o 3 : 10-20%, the purity is more than 99%, and the particle diameter is 5-10 nanometers;

[0047] Methyl-modified fumed silica 0.5%, its purity is 99%, particle size 10-20 nanometers.

[0048] Stir evenly in a high-speed mixer according to the above ratio, then put it into a stainless steel three-stick machine and mix for 3-5 times, and finally prepare a uniformly mixed silver paste sample.

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Abstract

The invention relates to silver paste for a solar cell and a preparation method thereof. The silver paste comprises certain amounts of silver powder, turpentine and glass powder and fumed silica by mass percent, preferably nano methyl modified fumed silica. The silver paste further comprises a nonionic polymer surfactant which is a polyethoxyl / polypropoxy / polyethoxyl triblock copolymer. The silver paste which is prepared by mixing and stirring the above components according to a certain proportion and sequence and is used for the front of the solar cell has good thixotropy, improves the screen printing quality on the silicon wafer, improves the height-width ratio of the sintered screen printing silver wires and reduces the occupied sunlight area, thus improving the efficiency of the solarcell.

Description

technical field [0001] The invention relates to a mixture for solar cells, in particular to a silver paste for solar cells and a preparation method thereof. Background technique [0002] Solar cells are made by combining two types of semiconductors called n-type and p-type semiconductors with different electrical properties, and then plating electrodes on the n-type and p-type semiconductors. On the light-irradiating side, the electrodes are usually made into a comb-like shape in order to allow light to enter the semiconductor. The front electrode is printed with silver paste, and the back electrode is printed with silver paste, silver-aluminum paste or aluminum paste. The silver paste for the front electrode is usually composed of silver powder, organic solvent, glass powder and so on. The silver paste used for the front electrode of solar cells usually requires good screen printing performance, and the fine lines of the printed front silver electrode must have good formi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00H01L31/0224
Inventor 赵世界韩鹏
Owner CHANGZHOU SVECK PHOTOVOLTAIC NEW MATERIAL
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